Just got my ID:Core Beam on Friday and while I am happy with the overall performance of that little magic box, there is one thing that bothers me. The moment I plug a guitar cable into the Beam, I get a continuous static background noise. It somehow sounds a bit like 1/f noise. It is too low in frequency to be white noise, at least as far as I can tell. I do not even have to plug a guitar or a pedal to the other end of the cable, the noise is always there as soon as the ammp is switched on. Even turning the volume to 0 does not make it go away. As a reference I plugged a Yamaha THR10 to the same power rail and the problem did not appear there.Is this by design of the amp (I hope not) or is there something to do that can fix this?